{"id":"CVE-2026-43240","title":"x86/kexec: add a sanity check on previous kernel's ima kexec buffer","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nx86/kexec: add a sanity check on previous kernel's ima kexec buffer\n\nWhen the second-stage kernel is booted via kexec with a limiting command\nline such as \"mem=<size>\",…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= b69a2afd5afce9bf6d56e349d6ab592c916e20f2 < 37f18915a261afe84dab462624ed829cddb77a9b","Linux >= b69a2afd5afce9bf6d56e349d6ab592c916e20f2 < 22e460b6333a5f818b042ac89201f8e735556f4a","Linux >= b69a2afd5afce9bf6d56e349d6ab592c916e20f2 < 7e2476057950c174c7b2c2802246707bbfb497e4","Linux >= b69a2afd5afce9bf6d56e349d6ab592c916e20f2 < f8f73bf0f8a57ee9b86792456bd42079bc98c6b7","Linux >= b69a2afd5afce9bf6d56e349d6ab592c916e20f2 < d4a132f121c591b60dbaf57ea91f1faf11631fbc","Linux >= b69a2afd5afce9bf6d56e349d6ab592c916e20f2 < 4d7a8f5f28187e3d2958b2a134473da2665207e7","Linux >= b69a2afd5afce9bf6d56e349d6ab592c916e20f2 < c5489d04337b47e93c0623e8145fcba3f5739efd","Linux 6.0"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-06T15:31:10.692661Z"},"published":"2026-05-06","updated":"2026-11-06","sourceUpdated":"2026-11-06T15:32:37.007Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-43240","references":[{"url":"https://git.kernel.org/stable/c/37f18915a261afe84dab462624ed829cddb77a9b"},{"url":"https://git.kernel.org/stable/c/22e460b6333a5f818b042ac89201f8e735556f4a"},{"url":"https://git.kernel.org/stable/c/7e2476057950c174c7b2c2802246707bbfb497e4"},{"url":"https://git.kernel.org/stable/c/f8f73bf0f8a57ee9b86792456bd42079bc98c6b7"},{"url":"https://git.kernel.org/stable/c/d4a132f121c591b60dbaf57ea91f1faf11631fbc"},{"url":"https://git.kernel.org/stable/c/4d7a8f5f28187e3d2958b2a134473da2665207e7"},{"url":"https://git.kernel.org/stable/c/c5489d04337b47e93c0623e8145fcba3f5739efd"}],"tags":["cve.org"],"epss":0.00123,"epssPercentile":0.02052,"ingestedAt":"2026-11-06T15:54:04.005Z","slug":"CVE-2026-43240","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nx86/kexec: add a sanity check on previous kernel's ima kexec buffer\n\nWhen the second-stage kernel is booted via kexec with a limiting command\nline such as \"mem=<size>\", the physical range that contains the carried\nover IMA measurement list may fall outside the truncated RAM leading to a\nkernel panic.\n\n    BUG: unable to handle page fault for address: ffff97793ff47000\n    RIP: ima_restore_measurement_list+0xdc/0x45a\n    #PF: error_code(0x0000) – not-present page\n\nOther architectures already validate the range with page_is_ram(), as done\nin commit cbf9c4b9617b (\"of: check previous kernel's ima-kexec-buffer\nagainst memory bounds\") do a similar check on x86.\n\nWithout carrying the measurement list across kexec, the attestation\nwould fail.\n\n## Affected\n\n- `Linux >= b69a2afd5afce9bf6d56e349d6ab592c916e20f2 < 37f18915a261afe84dab462624ed829cddb77a9b`\n- `Linux >= b69a2afd5afce9bf6d56e349d6ab592c916e20f2 < 22e460b6333a5f818b042ac89201f8e735556f4a`\n- `Linux >= b69a2afd5afce9bf6d56e349d6ab592c916e20f2 < 7e2476057950c174c7b2c2802246707bbfb497e4`\n- `Linux >= b69a2afd5afce9bf6d56e349d6ab592c916e20f2 < f8f73bf0f8a57ee9b86792456bd42079bc98c6b7`\n- `Linux >= b69a2afd5afce9bf6d56e349d6ab592c916e20f2 < d4a132f121c591b60dbaf57ea91f1faf11631fbc`\n- `Linux >= b69a2afd5afce9bf6d56e349d6ab592c916e20f2 < 4d7a8f5f28187e3d2958b2a134473da2665207e7`\n- `Linux >= b69a2afd5afce9bf6d56e349d6ab592c916e20f2 < c5489d04337b47e93c0623e8145fcba3f5739efd`\n- `Linux 6.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}